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https://issues.apache.org/jira/browse/HIVE-18887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aihua Xu updated HIVE-18887:
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Issue Type: Sub-task (was: Improvement)
Parent: HIVE-19010
> Improve preserving column stats for alter table commands
> --------------------------------------------------------
>
> Key: HIVE-18887
> URL: https://issues.apache.org/jira/browse/HIVE-18887
> Project: Hive
> Issue Type: Sub-task
> Components: Metastore
> Affects Versions: 3.0.0
> Reporter: Aihua Xu
> Assignee: Aihua Xu
> Priority: Major
>
> We are trying to preserve column stats for certain alter table commands,
> while seems that current generic approach which compare the old columns
> against the new columns and update for all the columns may not be efficient .
> e.g., if we just rename the table, we should be able to update the name
> itself. COL_STATS table somehow contains DB_Name and Table_Name. If those
> tables don't have these columns, certain commands don't even need to update
> these tables.
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